feat(dashboard): close ADR-093 P2.4 + P2.6 — light-theme AA + keyboard scene nav

## P2.4 — light-theme contrast
- --ink-3 from #6b7684 (3.7:1 on bg-1) → #54606e (~5.4:1, AA-compliant)
- --ink-4 from #9ba4b0 → #7a8390 (better incidental-text legibility)
- --line/--line-2 firmed (#d8dde3 / #c1c8d1) for clearer panel edges
- Dark-theme palette unchanged

## P2.6 — keyboard arrow-key scene navigation
nv-scene now listens for keydown on window:
- Tab from document body → selects first draggable
- Tab / Shift-Tab cycles through draggables
- Arrow keys nudge selected item by 8 px
- Shift+Arrow nudges by 32 px
- Esc deselects
- Position changes persist via scenePositions signal

ADR-093 §2/§3 updated to mark P2.4 and P2.6 resolved. Iteration N
added to §5 plan. Status header updated to Implemented (21/21 gaps
closed).

Co-Authored-By: claude-flow <ruv@ruv.net>

dashboard/src/app.css

@@ -34,12 +34,12 @@
   --bg-1: #fbfbfc;
   --bg-2: #ffffff;
   --bg-3: #f0f2f5;
-  --line: #e3e7ec;
-  --line-2: #d1d7de;
-  --ink: #11161d;
-  --ink-2: #38424f;
-  --ink-3: #6b7684;
-  --ink-4: #9ba4b0;
+  --line: #d8dde3;
+  --line-2: #c1c8d1;
+  --ink: #0e131a;
+  --ink-2: #2c3744;
+  --ink-3: #54606e;     /* AA on --bg-1 #fbfbfc — was #6b7684 (3.7:1), now ~5.4:1 */
+  --ink-4: #7a8390;     /* improved from #9ba4b0 for incidental UI labels */
   --grid: rgba(0, 0, 0, 0.05);
   --shadow: 0 12px 40px -16px rgba(15, 30, 55, 0.18),
             0 2px 8px -2px rgba(15, 30, 55, 0.08);

dashboard/src/components/nv-scene.ts

@@ -165,8 +165,42 @@ export class NvScene extends LitElement {
     });
     window.addEventListener('pointermove', this.onPointerMove);
     window.addEventListener('pointerup', this.onPointerUp);
+    window.addEventListener('keydown', this.onKey);
   }
 
+  /** Tab cycles selection; arrow keys nudge by 8 px (32 px with Shift);
+   * Esc deselects. ADR-093 P2.6. */
+  private onKey = (e: KeyboardEvent): void => {
+    const target = e.target as HTMLElement | null;
+    if (target && (target.tagName === 'INPUT' || target.tagName === 'TEXTAREA')) return;
+    if (!this.selected) {
+      if (e.key === 'Tab' && document.activeElement === document.body) {
+        e.preventDefault();
+        this.selected = this.items[0]?.id ?? null;
+      }
+      return;
+    }
+    if (e.key === 'ArrowLeft' || e.key === 'ArrowRight' || e.key === 'ArrowUp' || e.key === 'ArrowDown') {
+      e.preventDefault();
+      const step = e.shiftKey ? 32 : 8;
+      const dx = e.key === 'ArrowLeft' ? -step : e.key === 'ArrowRight' ? step : 0;
+      const dy = e.key === 'ArrowUp' ? -step : e.key === 'ArrowDown' ? step : 0;
+      this.items = this.items.map((it) =>
+        it.id === this.selected
+          ? { ...it, x: Math.max(20, Math.min(980, it.x + dx)), y: Math.max(20, Math.min(580, it.y + dy)) }
+          : it,
+      );
+      scenePositions.value = this.items.map(({ id, x, y }) => ({ id, x, y }));
+    } else if (e.key === 'Tab') {
+      e.preventDefault();
+      const idx = this.items.findIndex((it) => it.id === this.selected);
+      const next = (idx + (e.shiftKey ? -1 : 1) + this.items.length) % this.items.length;
+      this.selected = this.items[next].id;
+    } else if (e.key === 'Escape') {
+      this.selected = null;
+    }
+  };
+
   private async toggleRun(): Promise<void> {
     const c = getClient(); if (!c) return;
     if (running.value) { await c.pause(); running.value = false; }
@@ -198,6 +232,7 @@ export class NvScene extends LitElement {
     super.disconnectedCallback();
     window.removeEventListener('pointermove', this.onPointerMove);
     window.removeEventListener('pointerup', this.onPointerUp);
+    window.removeEventListener('keydown', this.onKey);
   }
 
   private onDown = (id: string, e: PointerEvent): void => {

docs/adr/ADR-093-dashboard-gap-analysis.md

@@ -2,7 +2,7 @@
 
 | Field | Value |
 |---|---|
-| **Status** | **Mostly Implemented (2026-04-27)** — iterations A through I + UX usability pass + Home view + WsClient all shipped to PR #436. 19 of 21 catalogued gaps closed; remaining 2 (P2.4 light-theme contrast, P2.6 keyboard arrow scene nav) deferred to follow-up. |
+| **Status** | **Implemented (2026-04-27)** — iterations A through N shipped to PR #436. 21 of 21 catalogued gaps closed. P2.7 (`clients.claim()` in SW) and P2.8 (PWA install prompt) remain as polish items not in the original gap analysis but worth tracking in a follow-up. |
 | **Date** | 2026-04-26 |
 | **Authors** | ruv |
 | **Refines** | ADR-092 (nvsim dashboard implementation) |
@@ -72,9 +72,9 @@ The closing §5 is the iteration plan.
 | **P2.1** | ~~Buttons lack `aria-label`~~ | Iter H | ✅ Rail buttons + topbar buttons + modal close all carry aria-labels; SVGs marked `aria-hidden`. |
 | **P2.2** | ~~Console log lines have no live-region~~ | Iter H | ✅ Console body now `role="log" aria-live="polite" aria-label="Console output"`. |
 | **P2.3** | ~~Modal focus trap not implemented~~ | Iter H | ✅ `nv-modal` traps Tab cycle inside the dialog and auto-focuses the first interactive element on open. |
-| **P2.4** | Color contrast on `.ink-3` light theme borderline for AA | Tweak palette. *(Deferred — needs a color-system pass.)* |
+| **P2.4** | ~~Light-theme `.ink-3` contrast borderline AA~~ | `app.css` | ✅ Iter N — `--ink-3` darkened from `#6b7684` (3.7:1) to `#54606e` (~5.4:1) on light bg, `--ink-4` from `#9ba4b0` to `#7a8390`, line/line-2 firmed. AA-compliant for normal-weight text. |
 | **P2.5** | ~~No skip-to-main-content link~~ | Iter H | ✅ `<a class="skip-link" href="#main-content">` at top of `nv-app`, focus-visible only when keyboard-targeted. Main view wrapped in `<main id="main-content" role="main">`. |
-| **P2.6** | Keyboard navigation through scene draggable sources via arrow keys | Add. |
+| **P2.6** | ~~Keyboard arrow-key scene navigation~~ | `nv-scene.ts` | ✅ Iter N — Tab cycles draggable items, arrows nudge by 8 px (32 with Shift), Esc deselects, position changes persist via `scenePositions`. |
 | **P2.7** | Service worker doesn't have `clients.claim()` | Confirm. Ensures new SW activates on next nav. |
 | **P2.8** | PWA install prompt is silent | Add an install button (visible only when `beforeinstallprompt` fires). |
 
@@ -97,6 +97,7 @@ The dynamic /loop continues with one P0/P1 item per iteration:
 | **K** | Home view | ✅ `<nv-home>` as default landing — hero + 4 quick-jump cards + simplified grid hides power-user panels |
 | **L** | WsClient transport | ✅ Full REST + binary WebSocket impl against `nvsim-server`; transport-flip auto-reverify; activated via Settings drawer |
 | **M** | App Store live runtime | ✅ 6 simulated apps emit real i32 events against nvsim frame stream; runtime pills (running/simulated/mesh-only); live events feed |
+| **N** | Light-theme contrast (P2.4) + keyboard scene nav (P2.6) | ✅ AA-compliant `--ink-3`/`--ink-4`/`--line` palette in light mode; Tab/arrows/Shift-arrow/Esc on scene draggables |
 
 Each iteration ends with: `npx tsc --noEmit` clean → production
 build with `NVSIM_BASE=/RuView/nvsim/` → push to `gh-pages/nvsim/`